Okay... I just got a new marble betta fish on November 25th. Since last week he has been darting across, up ,down, all over his tank. There is NO fish with him in the tank. Once, I spied on him and he was darting and NO ONE WAS THERE AT ALL. Is this normal or does he have seizures? You see when a betta fish chokes it swims crazily trying to spit it out? Thats what he does BEFORE I feed him and AFTER i feed him....